论文标题
较高的拓扑充电和QCD真空
Higher topological charge and the QCD vacuum
论文作者
论文摘要
结果表明，具有较高拓扑电荷的量规场配置修改了QCD真空的结构，QCD真空的结构反映在其对CP竞争拓扑相$θ$的依赖性中。为了探讨这一点，这里研究了拓扑敏感性和斧头暗物质的产生。前者表征了拓扑电荷分布，因此是QCD拓扑结构的敏感探针。后者取决于轴的有效潜力，轴是由QCD的$θ$依赖性决定的。因此，通过斧头的真空调整机制生产冷暗物质可能会受到更高的拓扑电荷效应的影响。这是在高温下在解义阶段进行质量讨论的，其中基于任意拓扑电荷的Instantons稀释气体的描述是有效的。结果，由于$θ$依赖性的非谐波修饰，拓扑敏感性表现出特征的温度依赖性。此外，多内斯坦效应产生了增加轴突暗物质量的拓扑机制。
It is shown that gauge field configurations with higher topological charge modify the structure of the QCD vacuum, which is reflected in its dependence on the CP-violating topological phase $θ$. To explore this, topological susceptibilities and the production of axion dark matter are studied here. The former characterize the topological charge distribution and are therefore sensitive probes of the topological structure of QCD. The latter depends on the effective potential of axions, which is determined by the $θ$-dependence of QCD. The production of cold dark matter through the vacuum realignement mechanism of axions can therefore be affected by higher topological charge effects. This is discussed qualitatively in the deconfined phase at high temperatures, where a description based on a dilute gas of instantons with arbitrary topological charge is valid. As a result, topological susceptibilities exhibit a characteristic temperature dependence due to anharmonic modifications of the $θ$-dependence. Furthermore, multi-instanton effects give rise to a topological mechanism to increase the amount of axion dark matter.
